"To use a crude analogy, if someone is stupid enought to bring a knife to a gunfight, it doesn't mean that those holding the guns have a moral obligation to fight with knives instead. Proportionality demands exactly that, and it leads to nothing but longer and more destructive wars. Part of the reasons nations build strong militaries is to deter people from committing aggressive acts against them. The United States did not build the military it has just to provide "proportionate" reponse. Such a limitation would invite any tinpot dictator or kleptocrat to attack us, knowing that we would only respond in proportion to their ability to attack. It makes every fight even-up from the beginning, odds that would encourage a lot more fighting, not less. [ D'oh -ed. ] "